SQL & PL/SQL

Oracle 12.1

Given the following table & data, how can I extract the values between the TAG tags for each record?

Thanks

create table foo(i int,str clob)
insert into foo values (1,'keyword1;keyword2;<tag>value1</tag>keyword3<tag>value2</tag>');
insert into foo values (2,'keyword1;keyword2;keyword3<tag>value</tag>keyword4;keyword5<tag>value4</tag>');

Output:

1 value1

1 value2

2 value

2 vaue4